Corner clamp with a plurality of rightangularly related clamping axes



Sept. 18. 1956 E. c. GROVES 2,763,303

CORNER CLAMP WITH A PLURALITY OF RIGHT-ANGULARLY RELATED CLAMPING AXES Filed March 25, 1954 mum 2n W2 Earl C 61 0066 A; -/6 INVENTOR 1 I BY I, I I J ATTORNEYS.

United States Patent CORNER CLAMP WITH A PLURALITY OF RIGHT- ANGULARLY RELATED CLAMPING AXES Earl C. Groves, Monette, Mo.; E. L. Monroe, administrator of the estate of said Groves, deceased Application March 25, 1954, Serial No. 418,626

1 Claim. (Cl. 144-297) This invention relates to a corner clamp and a means for clamping together two articles which are to be glued or otherwise secured together.

It is an object of this invention to provide a corner clamp of the kind to be more particularly described hereinafter which is particularly suited for wood assembly and will clamp either left or right corner assembly.

It is another object of this invention to provide a corner clamp of this kind for clamping together Wood elements as the elements of a chair or table which are glued together.

It is yet another object of this invention to provide a corner clamp of this kind which is easy to make and which may be constructed at an economical cost for distribution to the general buying public.

Other and further objects and advantages of the invention will be hereinafter described and the novel features thereof defined in the appended claim.

In the drawings:

Fig. 1 is a top plan view of a corner clamp constructed according to an embodiment of this invention.

Fig. 2 is a side elevation of the corner clamp.

Fig. 3 is a longitudinal section of the corner clamp.

Fig. 4 is a transverse section taken on the line 44 of Fig. 1.

Fig. 5 is a transverse section taken on the line 5-5 of Fig. 1.

Referring now more particularly to the drawings the numeral designates generally a corner clamp constructed according to an embodiment of my invention for clamping together a pair of wood pieces or work pieces while they are being glued and the glue is drying.

The corner clamp 10 is provided with a pair of longitudinally extending flat plates 11 and 12 which are secured together at one end by a connecting block 14. The plates 11 and 12 are secured to the connecting block 14 by rivets 15 or any other suitable and desirable fastening means.

One of the plates, as the plate 12, is provided with a depending foot 16 which is adapted to engage the upper surface of a work table or any other suitable fixed support.

The connecting block 14 has a threaded opening 17 therethrough which extends parallel to the planes of the plates 11 and 12 and a screw 18 threadably engages through the threaded opening 17 having a handle 19 at one end of the screw which may be actuated by an operator of the corner clamp when he desires to clamp together a pair of work pieces which are secured together while the securingmeans, as glue, is drying.

A head 20 is rotatably secured to the end of the screw 18 between the plates 11 and 12 at the end of the screw remote from the handle 19 and between the plates 11 and 12 for engaging a work piece therebetween and moving or urging the work piece longitudinally of the corner clamp 10. The head 20 is secured to the end of the screw remote from the handle by a pin 21 which is swedged to secure the pin to the screw and yet provide for 2,763,303 Patented Sept. 18, 1956 the rotation of the screw relative to the head as the head is engagable with a work piece in the corner clamp 10.

A C clamp 24 is positioned at the other end of the plates 11 and 12 remote from the connecting block 14 for clampingly securing another work piece in the corner clamp.

The C glarnp 24 has a horizontally extending arm 25 and a second horizontally extending arm 26 spaced from the arm 25 and connected thereto by a bight 27 in much the same manner as a conventional C clamp.

One of the arms of the C clamp 24, as the horizontal arm 25 is flattened adjacent the end thereof remote from the bight 27 and has an opening 28 therethrough which is used as a sight opening for determining the condition of the work piece clamped therein.

The arm 25 is also provided with a threaded opening 29 therethrough within which a threaded screw 30 is engageable much in the same manner as an ordinary C clamp.

The screw 30 has a lug 31 on one end thereof at a diameter reduced from the outside diameter of the screw threads on the screw and the lug 31 on the screw is engageable in an opening 32 on one of the plates as the plate 11 clearly shown in the drawings. The lug 31 is rotatable in the opening 32 to accommodate the rotation of the screw 30 as the screw is rotated for urging together this free end of the plates 11 and 12 remote from the connecting block 14.

The plate 12 has an opening 34 therethrough for accommodating and receiving a lug 35 which extends outwardly from the arm 26 so that the lug 35 may be rotated in the opening 34. The openings 32 and 34 are in axial alignment to provide for the rotation of the O clamp from a position on one side of the plates 11 and 12 to a position on the other side of the plates and thereby accommodate the clamping together of a left and right handed corner as the case may be.

The horizontal arm 26 is enlarged and more or less flattened so that it will extend downwardly from the corner clamp and the lower edge of the arm 26 is coplanar with the lower edge of the foot 16 to thereby balance the corner clamp 10 on a supporting surface.

A handle 36 is carried by the screw 30 at the upper end thereof remote from the plates 11 and 12.

Horizontal slots 37 are formed in the arm 11 adjacent to the connecting block 14 to provide for the inspection of the work piece in engagement with the head 20 while the work piece is being clamped in the corner clamp 10.

In the use and operation of the corner clamp 10 the C clamp is initially loosened and the head 20 of the corner clamp is moved as close to the connecting block 14 as possible so that the wooden materials to be glued together may be disposed between the plates 11 and 12 while they are drying and hardening. The exact disposition of the C clamp will depend upon the angular position of the work pieces to each other and to the corner clamp and the C clamp may be rotated about the lugs 31 and 35 to suit the particular position of the work pieces engaged in the comer clamp.

The screw 18 may then be tightened in the connecting block to move the work pieces longitudinally of the corner clamp and the C clamp may be tightened at the time when the corner clamp 10 is suitably positioned to the work pieces.

While the specific details of one embodiment of this invention have been herein shown and described, the invention is not confined thereto as changes and alterations may be made without departing from the spirit and scope thereof as defined in the appended claim.

I claim:

A corner clamp of the kind described comprising a pair of vertically spaced apart parallel elongated plates between which work pieces are adapted to be engaged to be secured together, a connecting block fixed to one end of said plates for connecting together said plates, the other ends of said plates being rounded and free from one another, a horizontal screw threadably engaged through said connecting block and extending longitudinally of said plates, a clamp engaged with the rounded ends of said plates transversely thereof, said clamp being rotatable about said rounded ends from one clamping position at one side and perpendicular to the plates to another cor- 10 responding position at the other side of said plates whereby said corner clamp may be used for clamping together right or left hand corner assemblies, said clamp having a pair of horizontal arms connected together with a vertical bight portion, a screw threadably engaged through one 15 of said latter arms transversely thereof, a lug on the end of said screw and a lug on the other of said arms, said lugs being rotatably engageable in openings adjacent the rounded ends of said plates.

References Cited in the file of this patent UNITED STATES PATENTS 488,546 Doddrell Dec. 27, 1892 506,114 Iseminger Oct. 3, 1893 1,620,469 Kirkholf Mar. 8, 1927 FOREIGN PATENTS 57,347 Switzerland Aug. 20, 1912 58,111 Denmark Oct. 28, 1940 

